linux-kernel - Re: [PATCH v2 net-next 00/26] net: introduce and use generic XDP stats

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Date:   Tue, 30 Nov 2021 10:56:26 -0700
From:   David Ahern <dsahern@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        Toke Høiland-Jørgensen 
        <toke@...hat.com>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Corbet <corbet@....net>,
        Shay Agroskin <shayagr@...zon.com>,
        Arthur Kiyanovski <akiyano@...zon.com>,
        David Arinzon <darinzon@...zon.com>,
        Noam Dagan <ndagan@...zon.com>,
        Saeed Bishara <saeedb@...zon.com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Russell King <linux@...linux.org.uk>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Edward Cree <ecree.xilinx@...il.com>,
        Martin Habets <habetsm.xilinx@...il.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Yajun Deng <yajun.deng@...ux.dev>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        David Ahern <dsahern@...nel.org>,
        Andrei Vagin <avagin@...il.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Cong Wang <cong.wang@...edance.com>, netdev@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, bpf@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 net-next 00/26] net: introduce and use generic XDP
 stats

On 11/30/21 10:07 AM, Jakub Kicinski wrote:
> On Tue, 30 Nov 2021 17:17:24 +0100 Toke Høiland-Jørgensen wrote:
>>> 1. Channels vs queues vs global.
>>>
>>> Jakub: no per-channel.
>>> David (Ahern): it's worth it to separate as Rx/Tx.
>>> Toke is fine with globals at the end I think?  
>>
>> Well, I don't like throwing data away, so in that sense I do like
>> per-queue stats, but it's not a very strong preference (i.e., I can live
>> with either)...
> 
> We don't even have a clear definition of a queue in Linux.
> 

The summary above says "Jakub: no per-channel", and then you have this
comment about a clear definition of a queue. What is your preference
here, Jakub? I think I have gotten lost in all of the coments.

My request was just to not lump Rx and Tx together under a 'channel'
definition as a new API. Proposals like zctap and 'queues as a first
class citizen' are examples of intentions / desires to move towards Rx
and Tx queues beyond what exists today.